At least one police officer was killed, another is in serious condition as law enforcement found the two men believed to be behind the Boston Marathon terrorist attacks. The first man, Tamerlan Tsarnaev, is believed to be dead, but Dzhokhar Tsarnaev is at large and the subject of a massive manhunt.

China's presumed next president Xi Jinping is in Washington today meeting with President Obama. Xi will also visit Los Angeles and the town of Muscatine, Iowa. The World's Jason Margolis has more on why China's next leader chose Iowa.

China's presumed next president Xi Jinping is in Washington today meeting with President Obama. Xi will also visit Los Angeles and the town of Muscatine, Iowa. The World's Jason Margolis has more on why China's next leader chose Iowa.

At least one police officer was killed, another is in serious condition as law enforcement found the two men believed to be behind the Boston Marathon terrorist attacks. The first man, Tamerlan Tsarnaev, is believed to be dead, but Dzhokhar Tsarnaev is at large and the subject of a massive manhunt.

At least one police officer was killed, another is in serious condition as law enforcement found the two men believed to be behind the Boston Marathon terrorist attacks. The first man, Tamerlan Tsarnaev, is believed to be dead, but Dzhokhar Tsarnaev is at large and the subject of a massive manhunt.

China's presumed next president Xi Jinping is in Washington today meeting with President Obama. Xi will also visit Los Angeles and the town of Muscatine, Iowa. The World's Jason Margolis has more on why China's next leader chose Iowa.